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<h1 class="topictitle1">Creating a Periodic Backup</h1>
<div><p>After resources to be protected are associated with an SLA, the system protects the resources based on the SLA. </p>
<div class="section"><h4 class="sectiontitle">Procedure</h4><ol><li><span>Choose <span class="uicontrol" id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839142377_uicontrol3409635183613"><b><span id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839142377_text94091435113619"><strong>Protection</strong></span> &gt; Databases &gt; openGauss</b></span>.</span></li><li><span>Click the <span class="uicontrol"><b><span><strong>Databases</strong></span></b></span> or <span class="uicontrol"><b><span><strong>Instance</strong></span></b></span> tab.</span></li><li><span>Select the database or instance to be protected and click <span class="uicontrol"><b><span><strong>Protect</strong></span></b></span>.</span><p><p>You can select multiple databases or instances.</p>
</p></li><li><span>Select an SLA. </span><p><p>You can also click <span class="uicontrol"><b><span>Create</span></b></span> to create an SLA.</p>
</p></li><li><span>Set the advanced parameters for backing up the database. </span><p><div class="p"><a href="#EN-US_TOPIC_0000001839189525__en-us_topic_0000001387428129_table354613271506">Table 1</a> describes related parameters.
<div class="tablenoborder"><a name="EN-US_TOPIC_0000001839189525__en-us_topic_0000001387428129_table354613271506"></a><a name="en-us_topic_0000001387428129_table354613271506"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001387428129_table354613271506" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Advanced parameters for backing up the database</caption><colgroup><col style="width:22.11%"><col style="width:77.89%"></colgroup><thead align="left"><tr><th align="left" class="cellrowborder" valign="top" width="22.11%" id="mcps1.3.2.2.5.2.1.2.2.3.1.1"><p>Parameter</p>
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<th align="left" class="cellrowborder" valign="top" width="77.89%" id="mcps1.3.2.2.5.2.1.2.2.3.1.2"><p>Description</p>
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</thead>
<tbody><tr><td class="cellrowborder" valign="top" width="22.11%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.1 "><p>Rate Limiting Policy</p>
</td>
<td class="cellrowborder" valign="top" width="77.89%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.2 "><p>Average maximum amount of data that can be transmitted per second by a backup job.</p>
</td>
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<tr><td class="cellrowborder" valign="top" width="22.11%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.1 "><p>Concurrency</p>
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<td class="cellrowborder" valign="top" width="77.89%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.2 "><p>Number of backup jobs that can be executed simultaneously.</p>
</td>
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<tr><td class="cellrowborder" valign="top" width="22.11%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.1 "><p>Standby Node Preferred</p>
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<td class="cellrowborder" valign="top" width="77.89%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.2 "><p>This configuration takes effect only for instance full backup.</p>
</td>
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<tr><td class="cellrowborder" valign="top" width="22.11%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.1 "><p>Job Failure Alarm</p>
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<td class="cellrowborder" valign="top" width="77.89%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.2 "><p>An alarm is generated if a job fails and is automatically cleared after successful execution.</p>
</td>
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<tr><td class="cellrowborder" valign="top" width="22.11%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.1 "><p>Source deduplication</p>
</td>
<td class="cellrowborder" valign="top" width="77.89%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.2 "><p>After this function is enabled, the amount of data to be transmitted can be reduced, but more client resources will be occupied.</p>
<div class="note"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_ul5885426132914"><li id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_li10885172616299">An agent host can only be linked with one storage unit. To enable source deduplication, select <span class="parmvalue" id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_parmvalue13417617181719"><b>Backup Storage Unit</b></span> for <span class="parmname" id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_parmname164341313131719"><b>Specify Target Location</b></span>. Otherwise, a storage unit that is not linked with the agent host may be selected through intelligent balancing. As a result, source deduplication fails to be enabled. If different protected objects are associated with different SLAs, where different backup storage units are specified, select different agent hosts for the protected objects. Otherwise, source deduplication of some backup jobs will fail to be enabled.</li><li id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_li9885182662911">If an agent host has been linked with a storage unit but is not performing a backup job with source deduplication, you can run the <strong id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_b1734071915190">dataturbo delete storage_object storage_name=</strong><em id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_i18291255102216">?</em> command on the agent host to delete the source deduplication link with the storage unit. The value of <strong id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_b9927131312572">storage_name</strong> in the command can be queried by running the <strong id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_b11782052162315">dataturbo show storage_object</strong> command. This way, when the agent host performs a backup job with source deduplication, the link between the agent host and a new storage unit can be established.</li><li id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_li11885142615297">Check whether the host OS supports source deduplication by referring to <a href="https://info.support.huawei.com/storage/comp/#/oceanprotect" target="_blank" rel="noopener noreferrer">Compatibility Query</a>. If the host OS does not support source deduplication, source deduplication does not take effect.</li><li id="EN-US_TOPIC_0000001839189525__en-us_topic_0000001839143189_li7883549153219">If a built-in agent is used for backup, source deduplication, after being configured, does not take effect.</li></ul>
</div></div>
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<tr><td class="cellrowborder" valign="top" width="22.11%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.1 "><p>Automatic Retry</p>
</td>
<td class="cellrowborder" valign="top" width="77.89%" headers="mcps1.3.2.2.5.2.1.2.2.3.1.2 "><p>After this function is enabled, the system automatically retries a failed job based on the number of retries and time preset.</p>
</td>
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</tbody>
</table>
</div>
</div>
</p></li><li><span>Click <span class="uicontrol"><b>OK</b></span>. </span><p><p>If the current system time is later than the first backup start time of the SLA, you can select to perform backup immediately after the backup SLA is associated or wait for the next scheduling based on the backup policy set in the SLA.</p>
</p></li></ol>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="en-us_topic_0000001792550136.html">Step 5: Performing Backup</a></div>
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